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Have you looked at anything downstream such as the elbow?
A rib could be out of place changing shoulder positioning.
This could be impacting the situation
Have you tried any of these options?
Better Benching and Pressing
Episode 78: Un-impinge yourself from mental slavery
Episode 31: 10 min squat & an Impingement Fix
One option is to have her lay on the floor and lift her arms straight up. Doing it on the floor removes gravity which can impact the ability to bring the arm to 90. This is why PT starts with the person doing this on the floor following surgery. You could have her hold a pvc pipe when doing it.
Thanks for your reply Kaitlin.